Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ef82cb7105753eb…

MALICIOUS

PDF

49.1 KB Created: 2020-07-27 22:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cc01b9794e5268faa3d98f032ace8063 SHA-1: 51bd98738fbb7cbb96948a3e5d246b06f16330cf SHA-256: 8ef82cb7105753eb7a88e525318a285f0d40e630729fb383aa24c21a3d293cea
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links, many of which point to a redirector service (ttraff.ru). This indicates the document is designed to lure users to malicious sites. The ML classifier strongly supports the malicious nature of this PDF. No scripts were extracted, but the link farm and redirector are sufficient indicators of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://ttraff.ru/pify?keyword=beery+vmi+6+sample+report
    • http://files.charteredengineers.org/uploads/1/3/2/7/132712508/6ae92.pdf
    • http://files.staceylynnsworkshop.com/uploads/1/3/1/3/131381464/xasivat_dufujewerasawe_sefigatokulumiv_kogafuz.pdf
    • http://files.richardmarshall-hardy.com/uploads/1/3/1/4/131437666/degolunoforanut_zuwazezufoje_kitifujetuvuxem_sagojikufusas.pdf
    • http://files.konajoanna.com/uploads/1/3/1/3/131398589/3826783.pdf
    • http://files.papermagicbook.com/uploads/1/3/1/8/131860787/nelakojopotazedi.pdf
    • http://files.charteredengineers.org/uploads/1/3/2/7
    • https://cdn.shopify.com/s/files/1/0429/2732/5343/files/4219193727.pdf
    • https://cdn.shopify.com/s/files/1/0436/0182/1859/files/1353651269.pdf
    • https://cdn.shopify.com/s/files/1/0427/8334/2748/files/vabala.pdf
    • https://cdn.shopify.com/s/files/1/0435/6807/0824/files/49846398511.pdf
    • https://cdn.shopify.com/s/files/1/0428/9980/0217/files/gakowozadivo.pdf
    • https://cdn.shopify.com/s/files/1/0433/3735/1326/files/71737880503.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/lujodegiduwidixerilaji.pdf
    • https://cdn.shopify.com/s/files/1/0429/3728/6812/files/51793293310.pdf
    • https://cdn.shopify.com/s/files/1/0433/0687/7080/files/53681635306.pdf
    • https://cdn.shopify.com/s/files/1/0436/1958/2110/files/38748838291.pdf
    • https://cdn.shopify.com/s/files/1/0429/2257/3990/files/weronow.pdf
    • https://cdn.shopify.com/s/files/1/0431/4211/9592/files/bureguwawez.pdf
    • https://cdn.shopify.com/s/files/1/0434/3001/9229/files/90934316676.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00008251.bin
4b17b8ce05bc360b7bc8e4a2c6540c14de1d64b943454b699c3e37bdae515ccd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8251 5012 bytes
font_01_sfnt_off00009363.bin
ba12f03eb861c8dfdcf34272ffbbb25b5875ea599638e32c5e716dde3ba56ea4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9363 10588 bytes

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